Nanchangs and Yaks have pitot tubes on the right wing, and engine turns opposite to cessna piper etc. an observation, pointing towards the undisturbed airflow hypothesis.
*Pedant mode on* Actually while the Chang's is out to the right, the Yak 52's is on the left. God knows why as their grand-daddy the Yak 18 had it out to the left and the Chang pre-dates the 52.
But - did the Griffon engined Spitfire have its pitot tube on a different side to the Merlin powered Spits?
Both on the left.
It's not going to be engine rotation. It would take some MIGHTY side-slip angles to get the prop wash out near the wing-tips. I think it's just a convenience/internal plumbing thing.
And just to further muddy the waters:
Tiger Moth - Right
Chipmunk - Left